Pneumatic packing.



E. S. JOHNSON. PNEUMATIC PACKING.

APPLICATION FILED MAB.18. 190s.

Patented Dec.'14, 1909.

" ATTORNEY nection 'ing.

UNITED sm gis Faro;

EDWIN SAMUEL JOHNSON, OF OAKLAND, CALIFORNIA, ASSIGNOR 0F ONE-HALF TO WILLIAM JAMES KNIGHT, OF'OAKLANID, CALIFORNIA.

PNEUMATIC PACKING.

To all whom it may concern:

Be it known that I, EDWIN SAMUEL J OHN- SON, a citizen of the United States, residing at Oakland, in the county of'Alameda and State of California, have invented certain new and useful Improvements in Pneumatic Packing, of whichthe following is a spe c1- fication.-

My invention relates to improvements in )neumatic packing.

The object of my inventionisto provide a packing permitting expansion without removing the same from its seat, and which can be readily applied and rests-compactly in the chamber which it occupies.

My device is especially appropriate for use in connection with piston rods ofpumps, elevators or in any stuffing box Where fiber packing is usually used. Y.

Referring to the accompanying drawing which illustrates my, invention, Figure 1 represents a longitudinal View of my pneuma'tic packing partly shown in section. Fig. 2 is an enlarged transverse section of the said packing, showing the feeding tube in contherewith 'as rearwardly affixed thereto. Fig. 3 is a --view of my packing as contained in a stufling box, and Fig. 4 18 a section of the packing. Fig. 5 is also an enlarged transverse section of said packing showing the valve hereinafter mentioned in section.

In the figures A represents the said pack- Solid rubber'ends or plugs for said packing are shown at 2, the same being cut angularly as shown .at 81% that the endsof Itohe packing will fit evenlyvand snugly in the 3 shows the flexible covering for the intermediate flexible folds 4.

5 indicates the inner flexible tube preferably of rubber.

6 shows the flexible tube for supplying air to expand the inner tube 5; the same being surmounted by the nipple 7 having a checkvalve thereunder as shown in Fig. 5, the said valve being also known as a bicycle valve. The said valve-consists of a head 15 and a stem 16 which are contained in a threaded \p'lug having a slot for said stem and a seat for said head centrally contained therein. The interior of the feeding tube'6 is threaded to accommodate the threaded plitg 17. The sald stem and headare vertically movable in said plug.

. ing in the form of strips,

12 indicates a washer to make a tight joint for the nipple 7 when said nipple is screwed on the-tube 6i V 14 indicates a slot in the plug 17 whereby the said plug may be inserted n the tube 6 by means of a screw driver. The tube 6 may be cemented to the packing A.

Specificationof Letters Patent. Patented Dec, 14, 1909,

9 shows the piston rod and 10 the stufling box.

The intermediate folds and covering therefor are preferably of canvas and the folds are arranged as shown in Fig. 2, and the packing so-surrounds the piston that the covering and the folds through wear are. in engagement therewith, the said folds and covering in the construction of theipacking being coated with cement sothat the same with the innertube 5 becomes one integral Object. By supplying air through the feeding tube 6 as shown in Fig. 1 by means of a bicycle pump the inner tube 5 can be expanded so that a uniform pressure is exerted on the piston rod notwithstanding that the canvas covering or folds as the case may be become worn by the friction of the piston rod.

In the construction of my packing having a small diameter two of the coverings 3 are preferably used, but for the larger sizes of the same more coverings may be used with advantage, the folds of thefirst-namedsize having a thickness of from one-eighth to one-fourth of an inch and are thence in- ,creased proportionately with the enlargement of the packing as'may be found suit-,

able. In the adjustment of my packing a hole should be bored into the stuffing box as shown in .Fig. 3. The solid rubber ends 2 are cemented to or cooked into the rubber tube 5 in the construction of the packing as may be preferred. v In the arrangement of the folds and coverings ,the flexible material may be folded and cemented the desired number of times and then the material may be Wound on the tube 5 so as to cover such folds without separ'atingv the same.

The invention may also be denominated a stutfing'box packing. 'The'folds 4 may also be applied in the construction of .the packthe narrowest strip be ng contiguous ,to the tub andthe superimposed strips gradually widen ng to the covering 3, cement being used as before mentioned, the whole being expansible through the pumping of air into the tube 6,: to inain-, tain a uniform pressure upon the piston-rod.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is:

1. In a stufiing-box packing a flexible tube having a transverse aperture in its wall and solid ends, a pluralityof folds of flexible material in contact therewith, said folds be ing superimposed, and a-covering of flexible material encircling said folds and said flexible tube. I

2. In a stuffing-box packing, a flexible tube having a transverse tube opening therein provided with a feeding tube and valve said'flexible tube having solid'ends with diagonal faces, a plurality of superimposed folds of flexible material in contact therewith, and a covering of flexible material encircling said folds and said flexible tube.

4. A packing for piston-rods having faces, said faces engaging the ends of said box, a pliable feeding tube opening into said flexible tube having a nipple and valve, a plurality of superimposed folds of flexible material in contact with said flexible tube,

and a covering of flexible material encircling said folds and said flexible tube.

5. A packing for piston-rods having in combination with a stutflng-box provided with a transverse opening, a cylindrical flexible tube having solid ends with diagonal faces, said faces engaging the ends of said box, means opening into said flexible tube for supplying air thereto, said means ex tending through said transverse opening, a plurality of superimposed strips of -material of unequal width in contact with said flexible tube, and coverings of flexible matube.

JOHNSON;

terial encircling said strips and said flexible In testimony whereof I aflix my signature, I I 

